expense tracker with tab layout (java & XML)

main.xml

Main (XML)

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.google.android.material.tabs.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:tabMode="fixed"
        app:tabGravity="fill" />

    <androidx.viewpager.widget.ViewPager
        android:id="@+id/viewPager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/tabLayout"/>

    <FrameLayout
        android:id="@+id/fragmentContainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"/>
</androidx.coordinatorlayout.widget.CoordinatorLayout>

main.java

Main.java

package com.example.expensetracker;

import android.os.Bundle;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.viewpager.widget.ViewPager;
import com.google.android.material.tabs.TabLayout;

public class MainActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private TabLayout tabLayout;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        viewPager = findViewById(R.id.viewPager);
        tabLayout = findViewById(R.id.tabLayout);

        TabAdapter adapter = new TabAdapter(getSupportFragmentManager());
        adapter.addFragment(new IncomeFragment(), "Income");
        adapter.addFragment(new ExpenseAdapter(), "Expenses");

        viewPager.setAdapter(adapter);
        tabLayout.setupWithViewPager(viewPager);
    }
}

tabactivity.java

TabActivity.java

package com.example.expensetracker;

import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import java.util.ArrayList;
import java.util.List;

public class TabAdapter extends FragmentPagerAdapter {

    private final List<Fragment> fragmentList = new ArrayList<>();
    private final List<String> fragmentTitleList = new ArrayList<>();

    public TabAdapter(FragmentManager fm) {
        super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
    }

    public void addFragment(Fragment fragment, String title) {
        fragmentList.add(fragment);
        fragmentTitleList.add(title);
    }

    @Override
    public Fragment getItem(int position) {
        return fragmentList.get(position);
    }

    @Override
    public int getCount() {
        return fragmentList.size();
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return fragmentTitleList.get(position);
    }
}

incomefragment.java

IncomeFragment.java

ckage com.example.expensetracker;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.fragment.app.Fragment;

public class IncomeFragment extends Fragment {
    private EditText incomeInput;
    private Button submitButton;
    private int totalIncome = 0;
    private int totalExpenses = 0;  // To store expenses received from ExpensesFragment

    public IncomeFragment() {
        super(R.layout.activity_income_fragment);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        incomeInput = view.findViewById(R.id.incomeInput);
        submitButton = view.findViewById(R.id.submitButton);

        // Receiving expenses from ExpensesFragment
        if (getArguments() != null) {
            totalExpenses = getArguments().getInt("totalExpenses", 0);
        }

        submitButton.setOnClickListener(v -> {
            String incomeText = incomeInput.getText().toString();
            if (!incomeText.isEmpty()) {
                totalIncome = Integer.parseInt(incomeText);
                Toast.makeText(getContext(), "Income: ₹" + totalIncome, Toast.LENGTH_SHORT).show();

                // Sending data to SummaryActivity
                Intent intent = new Intent(getActivity(), SummaryActivity.class);
                intent.putExtra("totalIncome", totalIncome);
                intent.putExtra("totalExpenses", totalExpenses);
                startActivity(intent);
            } else {
                Toast.makeText(getContext(), "Please enter a valid income!", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

incomefragment.xml

IncomeFragment (XML)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp"
    android:gravity="center"
    >

    <EditText
        android:id="@+id/incomeInput"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter Income"
        android:inputType="number"/>

    <Button
        android:id="@+id/submitButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Submit"/>
</LinearLayout>

expenseadapter.java

ExpenseAdapter.java

package com.example.expensetracker;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.fragment.app.Fragment;

public class ExpenseAdapter extends Fragment {
    private EditText rentInput, groceriesInput, billsInput, transportInput;
    private Button calculateButton;
    private int totalExpenses = 0;

    public ExpenseAdapter() {
        super(R.layout.activity_expense_adapter);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        rentInput = view.findViewById(R.id.rent);
        groceriesInput = view.findViewById(R.id.groceries);
        billsInput = view.findViewById(R.id.bills);
        transportInput = view.findViewById(R.id.transport);
        calculateButton = view.findViewById(R.id.calculateButton);

        calculateButton.setOnClickListener(v -> {
            int rent = getInputValue(rentInput);
            int groceries = getInputValue(groceriesInput);
            int bills = getInputValue(billsInput);
            int transport = getInputValue(transportInput);

            totalExpenses = rent + groceries + bills + transport;
            Toast.makeText(getContext(), "Total Expenses: ₹" + totalExpenses, Toast.LENGTH_SHORT).show();

            // Sending expenses to IncomeFragment
            Bundle bundle = new Bundle();
            bundle.putInt("totalExpenses", totalExpenses);
            IncomeFragment incomeFragment = new IncomeFragment();
            incomeFragment.setArguments(bundle);

            requireActivity().getSupportFragmentManager().beginTransaction()
                    .replace(R.id.fragmentContainer, incomeFragment)
                    .commit();
        });
    }

    private int getInputValue(EditText editText) {
        String text = editText.getText().toString();
        return text.isEmpty() ? 0 : Integer.parseInt(text);
    }
}

expenseadapter.xml

ExpenseAdapter (XML)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="20dp">

    <EditText
        android:id="@+id/rent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter Rent"
        android:inputType="number" />

    <EditText
        android:id="@+id/groceries"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter Groceries Expense"
        android:inputType="number" />

    <EditText
        android:id="@+id/bills"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter Bills Expense"
        android:inputType="number" />

    <EditText
        android:id="@+id/transport"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter Transport Expense"
        android:inputType="number" />

    <Button
        android:id="@+id/calculateButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Calculate Expenses"
        android:backgroundTint="@color/black"
        android:textColor="@android:color/white"
        android:layout_marginTop="20dp"/>
</LinearLayout>

summary.java

Summary.java

package com.example.expensetracker;

import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class SummaryActivity extends AppCompatActivity {
    private TextView summaryText;
    private int totalIncome, totalExpenses;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_summary);

        summaryText = findViewById(R.id.summaryText);

        // Receiving data from IncomeFragment
        Intent intent = getIntent();
        if (intent != null) {
            totalIncome = intent.getIntExtra("totalIncome", 0);
            totalExpenses = intent.getIntExtra("totalExpenses", 0);

        }



        int difference = totalIncome - totalExpenses;
        Toast.makeText(this, "Remaining Balance: ₹" + difference, Toast.LENGTH_LONG).show();

        summaryText.setText("Income: ₹" + totalIncome + "\nExpenses: ₹" + totalExpenses+"\nBalance: "+difference);
    }
}

summary.xml

Summary (XML)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        android:id="@+id/summaryText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Summary"
        android:textSize="18sp"
        android:textStyle="bold"/>
</LinearLayout>